There is so called locked-in syndrome that refers to a physical state when an individual is aware (he has an ability to hear and see) but he due to some reasons loses an ability to move. So people suffering from the syndrome can’t speak even though they are awake and understand absolutely everything. So it means that almost all the voluntarily muscles are paralyzed except eyes. The only possible way to communicate with other people is to blink the eyes which are not paralyzed. And it is still unknown what can cause this condition of human body. Nevertheless they think that there are several possible causes of the disease. Among them are: medication overdose, brain injury, damage of nerves and some others. Unfortunately locked-in syndrome is cure less. Strangely enough but there are two women who managed to recover from this state. They are lucky indeed.